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Calibration
Air Conduction
Bone
Conduction
Effective masking
Transducers –
Headband tension
Patient Response
switch
Patient
communication
Special tests/test
battery
Inputs
Outputs
Accuracy
Precision
Stimuli
Tone
Warble Tone
Pulse Tone
Masking
Presentation
Level
Frequency
range
Weight MA 28:
Dimensions
MA 28:
Display:
Language Settings: Deutsch, English, Español, Franҫais, Italiano, Nederlands,
PC Connection:
Warm-up time:
8506915 Rev. 5
Calibration information and instructions are located in the MA 28
Service Manual.
DD45
IP30
DD450
DD65 v2
B71
B81
Placement:
ISO 389-4, ANSI S3.6
DD45
DD450/DD65 v2
B71/B81 Bone
One push button
Talk Forward (TF)
Auto threshold:Hughson Westlake:
Time window for patient response: 2 s
Tone, Warble Tone +5 %, 5 Hz (true sine wave frequency modulation)
Left, Right, Bone
Frequency ± 2 %
1 dB or 5 dB
125 Hz - 8000 Hz
5 Hz sine +/- 5 % modulation
Pulse Length: 250 ms or 500 ms
Narrow band noise: IEC 60645-1, 5/12 Octave filter with the
same center frequency resolution as pure tone. Synchronous
masking: Locks channel 2 attenuator to channel 1 attenuator
Alternative: White noise
Presenter or Interrupter. Single, Pulse or Warble.
AC: -10 dB HL to 110 dB HL
Extended range function: Warning displayed when 100 dB HL
reached. Extended range is accessed automatically. Extended
range only available when mains powered and not with USB-
Cable connection.
125 Hz to 8000 Hz. Frequencies can be freely deselected
(except 1000 Hz)
1.9 kg / 4.1 lbs
380 mm x 270 mm x 140 mm
14.96 in x 10.62 in x 5.51 in
4.3 in in in full color display with normally white LED back-light
Polski, Русский, 中文.
1 x USB B for PC Connection (comparable with USB 1.1 and later)
Approx. 1 minute (incl. bootup-time)
Operation Manual MA 28
MAICO Standard Values
ISO 389-2, ANSI S3.6
MAICO Standard Values
MAICO Standard Values
ISO 389-3, ANSI S3.6
ISO 389-3, ANSI S3.6
Mastoid
Headband Static Force 4.5 N ± 0.5 N
Headband Static Force 10.0 N ± 0.5 N
Headband Static Force 5.4 N ± 0.5 N
BC: -10 dB HL to 80 dB HL Available
,
44
05/05/2021
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